+ Gtk::HBox options_box;
+ Gtk::RadioButton::Group source_group;
+ Gtk::RadioButton region_contents_button;
+ Gtk::RadioButton track_output_button;
+ Gtk::Button select_tracks_button;
+ Gtk::Button select_busses_button;
+ Gtk::Button select_none_button;
+ void select_tracks ();
+ void select_busses ();
+ void select_none ();